Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Cash flows from operating activities:
Net income		$ 114,539,000		$ 107,748,000		$ 93,294,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		9,725,000		13,796,000		10,257,000
Depreciation, amortization and accretion, net		13,354,000		21,939,000		20,658,000
Deferred income tax expense (benefit)		(3,116,000)		(435,000)		1,823,000
Gain on sale of mortgage loans held for sale		(2,431,000)		(1,690,000)		(521,000)
Origination of mortgage loans held for sale		(114,773,000)		(105,912,000)		(135,045,000)
Proceeds from sale of mortgage loans held for sale		116,974,000		104,152,000		145,133,000
Bank owned life insurance income	[1]	(2,443,000)		(2,253,000)		(1,597,000)
(Gain)/loss on the sale of premises and equipment	[1]	100,000		30,000		(4,341,000)
Loss on sale of available for sale debt securities		0	[1]	44,000	[1]	0
(Gain)/loss on the sale of other real estate owned		0		43,000		(46,000)
Loss on disposition of LFA		0		0		870,000
Stock compensation expense		3,773,000		4,464,000		4,394,000
Excess tax benefit from share-based compensation arrangements		(1,228,000)		(644,000)		(1,713,000)
Net change in accrued interest receivable and other assets		(1,337,000)		(3,941,000)		(14,165,000)
Net change in accrued interest payable and other liabilities		9,731,000		(30,638,000)		(10,259,000)
Net cash provided by operating activities		142,868,000		106,703,000		108,742,000
Cash flows from investing activities:
Purchases of available for sale debt securities		(396,656,000)		(6,025,000)		(196,488,000)
Proceeds from sales of available for sale debt securities		0		2,412,000		0
Proceeds from sales of acquired available for sale debt securities		0		0		2,111,000
Proceeds from maturities and paydowns of available for sale debt securities		434,765,000		144,449,000		169,499,000
Purchases of held to maturity debt securities		0		0		(459,183,000)
Proceeds from maturities and paydowns of held to maturity debt securities		70,044,000		33,632,000		145,902,000
Purchase of bank owned life insurance		0		0		(30,000,000)
Purchases of FHLB stock		(33,711,000)		(28,800,000)		0
Proceeds from redemption of FHLB stock		28,344,000		23,492,000		2,883,000
Proceeds from the disposition of LFA		0		0		4,993,000
Net change in non-PPP loans		(740,333,000)		(587,873,000)		(423,622,000)
Purchase of loans from broker		0		0		(82,074,000)
Purchases of premises and equipment		(9,848,000)		(7,731,000)		(18,441,000)
Proceeds from sale or disposal of premises and equipment		223,000		1,732,000		24,732,000
Other investment activities		(31,532,000)		(14,235,000)		(3,502,000)
Proceeds from sales of other real estate owned		0		624,000		7,168,000
Cash for acquisition, net of cash acquired		0		0		349,456,000
Net cash used in investing activities		(677,057,000)		(424,049,000)		(384,425,000)
Cash flows from financing activities:
Net change in deposits		495,653,000		279,496,000		(515,669,000)
Net change in securities sold under agreements to repurchase and federal funds purchased		3,649,000		23,712,000		(9,929,000)
Proceeds from FHLB advances		1,000,000,000		950,000,000		50,000,000
Repayments of FHLB advances		(900,000,000)		(800,000,000)		0
Repayment of acquired line of credit		0		0		(3,200,000)
Repurchase of common stock		(4,217,000)		(2,695,000)		(4,806,000)
Cash disbursements to non-controlling interest		0		0		(322,000)
Disposition of LFA		0		0		(915,000)
Cash dividends paid		(35,835,000)		(34,575,000)		(33,301,000)
Net cash provided by (used in) financing activities		559,250,000		415,938,000		(518,142,000)
Net change in cash and cash equivalents		25,061,000		98,592,000		(793,825,000)
Beginning cash and cash equivalents		265,959,000		167,367,000		961,192,000
Ending cash and cash equivalents		291,020,000		265,959,000		167,367,000
Supplemental cash flow information:
Interest paid		156,021,000		97,930,000		17,909,000
Income tax paid, net of refunds		19,428,000		35,330,000		20,892,000
Cash paid for operating lease liabilities		4,672,000		4,063,000		3,833,000
Supplemental non-cash activity:
Change in unfunded commitments in tax credit investments		19,012,000		165,435,000		6,517,000
Due to broker		10,447,000				22,245,000
Dividends payable to stockholders		255,000		239,000		230,000
Premises and equipment transferred to premises held for sale		0		871,000		21,662,000
Loans transferred to OREO		0		0		587,000
Fair value of assets acquired		0		0		1,403,509,000
Cash paid in acquisition		0		0		30,994,000
Common stock issued in acquisition		0		0		133,825,000
Non-controlling interest of acquired entity		0		0		3,094,000
Total consideration paid		0		0		167,913,000
Liabilities assumed		0		0		1,235,596,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Cash flows from investing activities:
Net change in PPP loans		$ 1,647,000		$ 14,274,000		$ 122,141,000

[1] Outside of the scope of ASC 606.